Trying to setup custom HTTP Response Headers on a new install of IIS7.5 on Windows Server 2008 R2 Standard and they are not working. Default headers work fine (X-Powered-By, etc...). Modifying default header values work (ie. change X-Powered-By to ASP.NET2). Modifying default header names cause header to stop being output (ie. Change X-Powered-By to X-Powered-By2).
Site in question is a test site with a single html page. Custom headers also don't work on ASP.NET 2.0 site.
I've tried setting the headers at the global level and at the site level to no effect.